Describes a situation when a person with a PhD goes on a killing rampage.

A variation of going postal, but used to describe a person with a doctoral degree.

" But of course lots of people--even Harvard grads!--suffer career setbacks, and few of them go postal (or should we say postdoctoral?). source: "Going Postdoctoral The bizarre case of Prof. Amy Bishop, Wall Street Journal Online, February 18, 2010.